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Helianthus ( / ˌhiːliˈænθəs /) [ 3] is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. [ 4][ 5] Except for three South American species, the species of Helianthus are native to North America and Central America.
Helianthus maximilianii Schrad. Helianthus maximiliani is a North American species of sunflower known by the common name Maximilian sunflower. [ 2] This sunflower is named for Prince Maximilian of Wied-Neuwied, who encountered it on his travels in North America. Helianthus maximiliani is native to the Great Plains in central North America, and ...
Helianthus giganteus is a perennial herbaceous plant that can grow up to 4–5 metres (13–16 ft) tall. The leaves are slender and lanceolate. The flower heads are bright yellow, up to 7 cm (3 in) in diameter. They are most commonly found in valleys with wet meadows or swamps [ 5][ 4] and even near river banks.
Helianthus californicus is a North American species of sunflower known by the common name California sunflower. It is native to California in the United States and Baja California in Mexico, where it grows in many types of habitats. [ 1][ 2][ 3] Helianthus californicus is an erect perennial herb growing from a network of tough, woody roots with ...
The plant flowers in summer. What is often called the "flower" of the sunflower is actually a "flower head" ( pseudanthium ), 7.5–12.5 centimetres (3–5 in) wide, [ 4] of numerous small individual five-petaled flowers ("florets"). The outer flowers, which resemble petals, are called ray flowers. Each "petal" consists of a ligule composed of ...
Helianthus atrorubens is a perennial herb sometimes as much as 200 cm (80 inches) tall. Most of the leaves are close to the base of the stem. One plant can produce 1-15 flower heads, each with 10-15 yellow ray florets surrounding 75 or more red or purple disc florets. The plant grows in mixed woods and along roadsides.
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